Amen. I come out of every movie and TV programme thinking, "why the hell did they do that?" If people behaved intelligently, drama wouldn't exist as a form of fiction.Yup and I'm going to have a little rant now and it will be a one and done deal. Sorry
The problem with these reviews or opinions is not that they wrong about the way the world and society should change but how they expect everyone to be exactly like them. There's a line from the Eurogamer review where the author says no woman would ever do what Deacons wife does or says in the game and that's bullshit. People do stupid shit all the time. It's becoming a major pain in my ass that people who critique books or games or whatever somehow project themselves on the characters and then proceed to say it's sloppy writing because no person would ever do that. I'll say it again people do and say stupid shit all the time and there shouldn't be outrage when a character in a work of fiction does.
Thanos's plan to eradicate half of all life was dumb. All that'd do is set back large populations like Human's 50 years because of exponential growth, whereas other close-to-extinction species would die out. And if Dr. Strange can make portals anywhere, why not make a portal next to Thanos, pull his arm through, close the portal thus cutting off his arm, portal the gauntlet immediately to another place/dimension and deal with it there? And the Flash in The Flash is a complete moron, always stopping to talk to his enemies instead of just dealing with them before they even know he's there, while the cops stand around refusing to shoot at super-villains for some reason even when those villains super-ness only comes from a fancy gun.
So even more than your point about human beings being fallible, fiction has a tendency to make them even dumber so that they can get a story out of situations that could resolved a lot better. If reviewers are going to criticise that, they need to rate everything ever made a 3 or less because of all the morons who populate the Hollywood realm!